六甲アイランド洪積粘土 (Ma-12層) の地質および土質工学的特性
1987 年 28 巻 2 号 p. 66-73
詳細
1987 年 28 巻 2 号 p. 66-73
Thick deposits of Upper Pleistocene clays are often found over wide areas of the north west of Osaka Bay, and the geotechnical properties of the clays become more important as a number of large reclamation works are in progress in this area. In this paper, we examine the environment in which the Uppermost Pleistocene clay (Ma-12) was deposited, and the micro-fossil analyses and the X-ray analysis were carried out on samples taken at the RokkoIsland in Kobe. We further examine the relationship between the geotechnical properties and the geological conditions of the clay.
The results of analyses of pollen-, nanno- and diatom-fossils indicate a distinct variation of the sedimentary environment in Ma-12. However, it is found that there is no major variation in components of the clay minerals with depth, despite of the environmental changes in the clay. On the other hand the geotechnical studies of Ma-12 shows that the sedimentary environment has a strong effect on the geotechnical properties of Ma-12 especially on the value of the liquid limit and the compressibility.
